G - Physics – 03 – B
Patent
G - Physics
03
B
352/53.76
G03B 27/52 (2006.01) G03G 15/22 (2006.01) G06K 17/00 (2006.01)
Patent
CA 1319988
APPARATUS FOR ELECTRONICALLY MAPPING FRAMES ON AN UPDATABLE MICROFICHE ABSTRACT An apparatus for electronically mapping an updatable microfiche includes a microprocessor-based analyzer programmed to control and evaluate optical scanning of the imaging frame areas arranged in generally parallel rows and columns, across the entire microfiche. Optical photosensors are used to detect the presence of a frame mark within an expected region of an imaged area. An electronic data mask retrievably stored in a mask table memory array is used to screen the output data from the sensors. The mask table is derived from relative sensor position data collected during a scanning operation on a calibrated microfiche. The calibration routine also determines average sensitivity levels of the sensors. During an calibration scan on a standardized microfiche, the mask table data and sensitivity levels are used to determine whether valid frame marks were detected. A look-up table memory array is used to store the results of an evaluation scan by storing which frames are imaged and which are available for imaging, thereby permitting non-sequential image development while preventing frame double exposure.
597458
Potzler J. Edward
Strahan Daryl J.
A. B. Dick Company
Sim & Mcburney
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